Visualization of strain distribution around fatigue crack developed by low cycle fatigue test in high-strength steels using digital image correlation method for replica films

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27690%2F22%3A10250464" target="_blank" >RIV/61989100:27690/22:10250464 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1044580322000134" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1044580322000134</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.matchar.2022.111731" target="_blank" >10.1016/j.matchar.2022.111731</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Visualization of strain distribution around fatigue crack developed by low cycle fatigue test in high-strength steels using digital image correlation method for replica films

Popis výsledku v původním jazyce

Strain distributions around the fatigue crack during the low cycle fatigue of high-strength ferrite + martensite dual-phase (DP) and tempered martensite (Mt) steels were visualized during cycles from the initial state to the crack initiation and crack propagation using a digital image correlation analysis applied to replica films. The replica film successfully transcribed the microstructure on the specimen surface. Although both the DP and Mt. steels exhibited a high tensile strength, the work-hardening rate of the DP steel was higher than that of Mt. steel. Although the numbers of cycles to failure (Nf) in the DP and Mt. steels were almost the same at the total strain amplitudes (et) of 0.005-0.008 and 0.02-0.03, the Nf in the DP steel was higher than that in the Mt. steel at the et of 0.008-0.02. The cracks were generated and propagated along the high-tensile-strain regions in both steels and were initiated when the accumulated strain along the loading direction exceeded a critical value regardless of the value of et or the steel applied. The increment of the accumulated strain in the Mt. steel was higher than that of the DP steel at the et of 0.01, whereas it was almost the same between those at the et of 0.03. The inhomogeneity of the strain distribution, which was quantitatively evaluated from the histogram of the strain distribution, increased as the number of fatigue cycles increased. The strain was rather inhomogeneously introduced in the Mt. steel in comparison to the DP steel at the et of 0.01, whereas almost no difference in the inhomogeneity of the strain distribution was detected between the steels at the et of 0.03. Thus, the inhomogeneous strain distribution may promote crack initiation and propagation, resulting in a low Nf at the et of 0.008-0.02 in Mt. steel.

Název v anglickém jazyce

Visualization of strain distribution around fatigue crack developed by low cycle fatigue test in high-strength steels using digital image correlation method for replica films

Popis výsledku anglicky

Strain distributions around the fatigue crack during the low cycle fatigue of high-strength ferrite + martensite dual-phase (DP) and tempered martensite (Mt) steels were visualized during cycles from the initial state to the crack initiation and crack propagation using a digital image correlation analysis applied to replica films. The replica film successfully transcribed the microstructure on the specimen surface. Although both the DP and Mt. steels exhibited a high tensile strength, the work-hardening rate of the DP steel was higher than that of Mt. steel. Although the numbers of cycles to failure (Nf) in the DP and Mt. steels were almost the same at the total strain amplitudes (et) of 0.005-0.008 and 0.02-0.03, the Nf in the DP steel was higher than that in the Mt. steel at the et of 0.008-0.02. The cracks were generated and propagated along the high-tensile-strain regions in both steels and were initiated when the accumulated strain along the loading direction exceeded a critical value regardless of the value of et or the steel applied. The increment of the accumulated strain in the Mt. steel was higher than that of the DP steel at the et of 0.01, whereas it was almost the same between those at the et of 0.03. The inhomogeneity of the strain distribution, which was quantitatively evaluated from the histogram of the strain distribution, increased as the number of fatigue cycles increased. The strain was rather inhomogeneously introduced in the Mt. steel in comparison to the DP steel at the et of 0.01, whereas almost no difference in the inhomogeneity of the strain distribution was detected between the steels at the et of 0.03. Thus, the inhomogeneous strain distribution may promote crack initiation and propagation, resulting in a low Nf at the et of 0.008-0.02 in Mt. steel.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20500 - Materials engineering

Projekt

<a href="/cs/project/EF17_049%2F0008441" target="_blank" >EF17_049/0008441: Inovativní léčebné metody pohybového aparátu v úrazové chirurgii</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Materials characterization

ISSN

1044-5803

e-ISSN

1873-4189

Svazek periodika

185

Číslo periodika v rámci svazku

111731

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

nestrankovano

Kód UT WoS článku

000748735800003

EID výsledku v databázi Scopus

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